If `(1+2x+x^2)^n=sum_(r=0)^(2n)a_r x^r ,t h e na=` `(^n C_2)^2` b. `^n C_rdot^n C_(r+1)` c. `^2n C_r` d. `^2n C_(r+1)`

If `(1+2x+x^2)^n=sum_(r=0)^(2n)a_r x^r ,t h e na=` `(^n C_2)^2` b. `^n C_rdot^n C_(r+1)` c. `^2n C_r` d. `^2n C_(r+1)`
A. `(""^(n)C_(r))^(2)`
B. `""^(n)C_(r) *""^(n)C_(r+1)`
C. `""^(2n)C_(r)`
D. `""^(2n)C_(r+1)`

If `(1+2x+x^2)^n=sum_(r=0)^(2n)a_r x^r ,t h e na=` `(^n C_2)^2` b. `^n C_rdot^n C_(r+1)` c. `^2n C_r` d. `^2n C_(r+1)`

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